WO1992017461A1 - Composes de protection contre la lumiere - Google Patents

Composes de protection contre la lumiere Download PDF

Info

Publication number
WO1992017461A1
WO1992017461A1 PCT/EP1992/000635 EP9200635W WO9217461A1 WO 1992017461 A1 WO1992017461 A1 WO 1992017461A1 EP 9200635 W EP9200635 W EP 9200635W WO 9217461 A1 WO9217461 A1 WO 9217461A1
Authority
WO
WIPO (PCT)
Prior art keywords
alkyl
oxy
methylisoxazol
alkynyl
alkenyl
Prior art date
Application number
PCT/EP1992/000635
Other languages
English (en)
Inventor
Ulrich Huber
Original Assignee
Givaudan-Roure (International) S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Givaudan-Roure (International) S.A. filed Critical Givaudan-Roure (International) S.A.
Priority to AU14171/92A priority Critical patent/AU653010B2/en
Priority to JP04506514A priority patent/JP3122465B2/ja
Priority to BR9204818A priority patent/BR9204818A/pt
Priority to DE69217148T priority patent/DE69217148T2/de
Priority to EP92907129A priority patent/EP0532725B1/fr
Publication of WO1992017461A1 publication Critical patent/WO1992017461A1/fr
Priority to US08/361,869 priority patent/US5481001A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/32—Polymers modified by chemical after-treatment
    • C08G65/329—Polymers modified by chemical after-treatment with organic compounds
    • C08G65/333—Polymers modified by chemical after-treatment with organic compounds containing nitrogen
    • C08G65/33396—Polymers modified by chemical after-treatment with organic compounds containing nitrogen having oxygen in addition to nitrogen
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D261/00—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings
    • C07D261/02—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings
    • C07D261/06—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having two or more double bonds between ring members or between ring members and non-ring members
    • C07D261/10—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having two or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D261/12—Oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
    • C07D413/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings directly linked by a ring-member-to-ring-member bond
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
    • C07D413/10—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a carbon chain containing aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
    • C07D413/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links

Definitions

  • the invention is concerned with light screening comp ⁇ ositions which contain isoxazolones, namely compounds of the formula
  • R 1 represents H, Ci-19-alkyl, C2-29-alkenyl, C2-29-alkynyl, optionally lower-alkyl or oxy-lower alkyl substituted phenyl
  • R 2 represents H, Ci-29-alkyl, C2-29-alkenyl, C2-29-alkynyl, optionally lower-alkyl or oxy-lower alkyl substituted phenyl
  • R 3 represents H, C ⁇ -29-alkyl, C ⁇ - 19 -hydroxyalkyl, C 1 - 19 - polyhydroxyalkyl, C2-29-alkenyl, C2-29-alkynyl, optionally lower-alkyl or oxy-lower alkyl substituted phenyl or optionally lower-alkyl or oxy-lower alkyl substituted pyridyl, a polyether residue, a phenylsulphonic acid residue, an d R 2 and R 3 together with the N atom can also form a ring.
  • the compounds of formula I are particularly suitable as light screening agents.
  • the invention is accordingly also concerned with the use of I as light screening agents.
  • the compound of formula I are partly novel and partly known .
  • the process comprises appropriately substituting an isoxazolone of the formula
  • R 1 has the above significance, in the 4-position.
  • Y signifies NHR 3 , OH, O-lower alkyl, halogen, NH 2 , NHR 5 .
  • R 3 can also be introduced by reaction with a halide R 3 Hal (F, Cl, Br, I) or a corresponding epoxide such as e.g. (CH2) 2 ⁇ , etc.
  • the secondary reaction step can be effected, e.g. in E, simultaneously with the primary reaction.
  • the secondary reaction step can be effected, e.g. in E, simultaneously with the primary reaction.
  • molecules with several, e.g. 2 or 3, isoxazole residues can also be formed.
  • One such amine would be e.g. a polyoxypropylenediamine, e.g. of the formula NH 2 CH[CH 3 ]CH 2 (OCH 2 CH 2 [CH3])nNH 2 , or a polyoxy- ethylenediamine, e.g. of the formula NH 2 CH2CH2(OCH2CH2) n NH2, in which n signifies e.g. a whole number of 1 to 30.
  • a or the primary step of B-E is conveniently carried out in a temperature range of about 0-150°C. It is carried out, if desired, in the presence of an inert solvent, e.g. diethyl ether, tetrahydro- furan, dioxan, toluene, xylene, dichloromethane, dichloroethane, etc.
  • an inert solvent e.g. diethyl ether, tetrahydro- furan, dioxan, toluene, xylene, dichloromethane, dichloroethane, etc.
  • the reaction is carried out in the presence of a base, preferably a weak base such as e.g. a tertiary amine, e.g. triethylamine, dimethylaniline, dimethylaminopyridine or diazabicyclooctane, or an inorganic base such as e.g. sodium phosphate, soda, potash, magnesium hydroxide or oxide; although sodium hydroxide or potassium hydroxide also comes into consideration.
  • a base preferably a weak base such as e.g. a tertiary amine, e.g. triethylamine, dimethylaniline, dimethylaminopyridine or diazabicyclooctane
  • an inorganic base such as e.g. sodium phosphate, soda, potash, magnesium hydroxide or oxide; although sodium hydroxide or potassium hydroxide also comes into consideration.
  • the reaction is conveniently carried out in a temperature range of 0-200°C, especially of 20-150°C
  • the addition of the primary amine R 3 NH2 is conveniently effected in a temperature range of about 0-200°C, especially of 50-160°C , optionally under pressure.
  • the use of a solvent is optional. The aforementioned solvents come into consideration.
  • the addition of this halide is optionally effected in the presence of a base, preferably a strong base, e.g. an alcoholate, an amide, an alkali hydroxide, etc.
  • a base preferably a strong base, e.g. an alcoholate, an amide, an alkali hydroxide, etc.
  • the convenient temperature range is that given above.
  • the addition of a solvent is optional.
  • a catalyst e.g. a strong base or a strong acid.
  • a catalyst e.g. a strong base or a strong acid.
  • alkali hydroxides, alcoholates, mineral acids, Lewis acids, etc. alkali hydroxides, etc.
  • the purification of the resulting compound I can be effected, for example, by crystallization or distillation.
  • Ci -29-alkyl residues are, for example:
  • Ci-i2-alkyl residues but also higher, e.g. C15-, C18-, C20 _ > C21-,
  • C24-, C27-, C29- residues and also lower alkyl (C ⁇ _6) residues, e.g. methyl, ethyl, propyl, butyl, hexyl, etc.
  • Suitable C2-29-alkenyl residues are, for example:
  • Suitable C2-29-alkynyl residues are in particular C2-6-alkinyl residues, e.g. 2-propynyl, 3-butynyl, 4-pentynyl, 1 ,1 -dimethylpropynyl, ⁇ -hexinyl, etc.
  • Examples of lower-alkyl and, respectively, the lower-alkyl part of oxy-lower alkyl are: OCH3, OC2H5. OC5H 1 1, OC6H13, etc.
  • R 2 and R 3 together with the N atom can also form a - saturated or unsaturated- ring, e.g. a 5- or 6-membered ring such as e.g. the pyrrolidinyl ring.
  • the total number of carbon atoms of R 1 and R 2 and R 3 conveniently does not exceed 30; because otherwise the relationship of the sizes of the residues R 1 , R 2 and R 3 compared with the light-absorbing part of the molecule (chromophore, i.e. the isoxazolone part) is unfavourable.
  • R 3 C3- 20 -alkyl, substituted phenyl; 2) as 1) whereby R 2 and R 3 together have 5-15, especially 9-13, C atoms;
  • R 1 methyl, but also hexyl and phenyl
  • the compounds I' are very well suited as light screening agents because they generally fulfil a majority of the foregoing requirements, especially parameters (1), (2), (3), (4), (5), (6) and (7) set forth above.
  • UV filters of structure I are novel chromophores having a high photostability.
  • the manufacture of the novel light screening compositions comprises incorporating a compound of general formula I into a cosmetic base which is suitable for light screening compositions.
  • a cosmetic base which is suitable for light screening compositions.
  • other conventional UV A or UV B filters can also be combined during this incorporation.
  • UV A filters are, for example:
  • UV B filters such as, for example, the following organic compounds belonging to the widest classes of substances can be mentioned as UV B filters i.e. as substances having absorption maxima between about 290 and 320 nm:
  • p-Aminobenzoic acid derivatives such as e.g. ethyl p- aminobenzoate and other esters, such as propyl, butyl, isobutyl p- aminobenzoate, ethyl p-dimethylaminobenzoate, glyceryl p- aminobenzoate, amyl p-dimethylaminobenzoate.
  • Cinnamic acid derivatives such as e.g. 2-ethoxyethyl p- methoxycinnamate, 2-ethylhexyl p-methoxycinnamate, p- methoxycinnamic acid ester mixtures, cinnamic acid ester mixtures.
  • Heterocyclic nitrogen compounds such as 2- phenylbenzimidazole derivatives, e.g. 2-phenylbenzimidazole-5- sulphonic acid.
  • Salicylic acid derivatives such as e.g. menthyl salicylate, homomenthyl salicylate, phenyl salicylate.
  • Benzophenone derivatives such as e.g. 4-phenylbenzo- phenone, 4-phenylbenzophenone-2-carboxylic acid isooctyl ester, 2-hydroxy-4-methoxybenzophenone-5-sulphonic acid.
  • Gallic acid derivatives such as e.g. digalloyl trioleate.
  • Arylidenecycloalkanones such as e.g. benzylidenecamphor.
  • Anthranilic acid derivatives such as e.g. menthyl anthranilate.
  • any usual preparation which corresponds to the cosmetic requirements e.g. creams, lotions, emulsions, salves, gels, solutions, sprays, sticks, milks and the like.
  • the light screening effect will, of course, also be dependent on the base which is used.
  • the intensity of the light screening activity also depends in the case of the same base on the concentration of active ingredient. Suitable concentrations are e.g. between 1-6%, preferably between 2-5%, of a compound of formula I in the cosmetic preparation.
  • the light screening agents are, however, also suitable against the damaging influence of light on other substrates to be protected.
  • further substrates there come into consideration e.g.: plastics and synthetic resins, soft resins, e.g. for contact lenses, varnishes, oils, waxes, furniture and car polishes, etc.
  • 275 g of caproyl chloride are added dropwise within 30 minutes to a solution of 500 ml of n-pentylamine in 1.4 1 of methylene chloride while cooling with ice and stirring. After standing at room temperature for 4 hours the reaction solution is washed in succession with 1 1 of 0.1N HCl, 1 1 of 0.1N NaOH and 1.5 1 of NaCl solution. The organic phase is concentrated on a rotary evaporator and dried in a high vacuum and gives 370 g of a crystalline mass (98% of theory). M.p. 37°C .
  • N-Pentyl-hexaneiminoyl chloride 81 g of the amide prepared above are dissolved in 800 ml of CCI4 and treated portionwise with 91 g of phosphorus pentachloride. This mixture is held at reflux temperature for 3 hours, whereby HCl evolves. Now, CCI4 and POCI3 are distilled off and finally the product is fractionated in a high vacuum at 80-85OC/0.2 mbar. Yield 62 g of a colourless oil (70% of theory).
  • 3-n-Hexylisoxazol-5(4H)-one is obtained in 99% yield as a reddish liquid by holding ethyl 3-oxo-pelargonate at reflux temperature for 1 hour with one equivalent of hydroxylamine hydrochloride and one equivalent of pyridine and thereafter working-up in the usual manner.
  • Example 1 The procedure described in Example 1 is repeated, but in section a) aniline is used in place of n-pentylamine and n eptanoyl chloride is used in place of caproyl chloride.
  • M.p. 83-84°C UV (EtOH): 320 nm ( ⁇ 19502).
  • N-isopropyl-caproamide is prepared in the same manner as in
  • Example 1 section a), from caproyl chloride and isopropylamine (yield 80%, b.p. 87 O C/0.1 Torr). 11 g thereof are added dropwise to 7 ml of dimethyl sulphate and the mixture is stirred at 25°C for 24 hours. By partition between aqueous potash solution and ether and subsequent concentration and distillation of the organic phase there are obtained 6.7 g (56%) of a yellowish liquid of N-isopropylcaproamide iminomethyl ether (b.p. 50°C/16 Torr).
  • Coco caprylate/caproate 3 5.00

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Cosmetics (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)

Abstract

Compositions de protection contre la lumière contenant un composé répondant à la formule (I), dans laquelle R1 représente H, alkyle C¿1-19?, alcényle C2-29, alcynyle C2-29, ou phényle éventuellement substitué par alkyle inférieur ou par oxy-alkyle inférieur; R?2¿ représente H, alkyle C¿1-29?, alcényle C2-29, alcynyle C2-29, ou phényle éventuellement substitué par alkyle inférieur ou oxy-alkyle inférieur; R?3¿ représente H, alkyle C¿1-19?, hydroxyalkyle C1-19, polyhydroxyalkyle C1-19, alcényle C2-29, alcynyle C2-29, phényle éventuellement substitué par alkyle inférieur ou par oxy-alkyle inférieur, pyridyle éventuellement substitué par alkyle inférieur ou oxy-alkyle inférieur, un reste polyéther ou un reste d'acide phénylsulfonique; et R?2 et R3¿ ainsi que l'atome de N peuvent également former un cycle.
PCT/EP1992/000635 1991-03-28 1992-03-23 Composes de protection contre la lumiere WO1992017461A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU14171/92A AU653010B2 (en) 1991-03-28 1992-03-23 Light screening agent
JP04506514A JP3122465B2 (ja) 1991-03-28 1992-03-23 光スクリーニング剤
BR9204818A BR9204818A (pt) 1991-03-28 1992-03-23 Agente de filtracao de luz
DE69217148T DE69217148T2 (de) 1991-03-28 1992-03-23 Isoxazole derivate als lichtschutzmittel
EP92907129A EP0532725B1 (fr) 1991-03-28 1992-03-23 Derives d'isoxazole comme composes de protection contre la lumiere
US08/361,869 US5481001A (en) 1991-03-28 1994-12-22 Light screening agent

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH94891 1991-03-28
CH512/92-4 1992-02-20
CH51292 1992-02-20
CH948/91-1 1992-02-20

Publications (1)

Publication Number Publication Date
WO1992017461A1 true WO1992017461A1 (fr) 1992-10-15

Family

ID=25684793

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/000635 WO1992017461A1 (fr) 1991-03-28 1992-03-23 Composes de protection contre la lumiere

Country Status (11)

Country Link
US (2) US5481001A (fr)
EP (1) EP0532725B1 (fr)
JP (1) JP3122465B2 (fr)
AT (1) ATE148462T1 (fr)
AU (1) AU653010B2 (fr)
DE (1) DE69217148T2 (fr)
DK (1) DK0532725T3 (fr)
ES (1) ES2097319T3 (fr)
IL (1) IL101379A (fr)
SG (1) SG47940A1 (fr)
WO (1) WO1992017461A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000044340A1 (fr) * 1999-01-28 2000-08-03 Cognis Deutschland Gmbh Preparations cosmetiques et/ou pharmaceutiques
US6420349B1 (en) * 1998-08-24 2002-07-16 Bristol-Myers Squibb Company Isoxazolinone antibacterial agents

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0199323A2 (fr) * 1985-04-26 1986-10-29 Hoechst Aktiengesellschaft 4-Amino substitué alcoylidène-3-aryl-5(4H) isoxazolones, procédé de préparation, médicaments les contenant et leur utilisation
EP0349418A1 (fr) * 1988-06-27 1990-01-03 L'oreal Dérivés d'hydroxy-4 isoxazoles, leur procédé de préparation et compositions cosmétiques et pharmaceutiques les contenant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0199323A2 (fr) * 1985-04-26 1986-10-29 Hoechst Aktiengesellschaft 4-Amino substitué alcoylidène-3-aryl-5(4H) isoxazolones, procédé de préparation, médicaments les contenant et leur utilisation
EP0349418A1 (fr) * 1988-06-27 1990-01-03 L'oreal Dérivés d'hydroxy-4 isoxazoles, leur procédé de préparation et compositions cosmétiques et pharmaceutiques les contenant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6420349B1 (en) * 1998-08-24 2002-07-16 Bristol-Myers Squibb Company Isoxazolinone antibacterial agents
WO2000044340A1 (fr) * 1999-01-28 2000-08-03 Cognis Deutschland Gmbh Preparations cosmetiques et/ou pharmaceutiques

Also Published As

Publication number Publication date
EP0532725B1 (fr) 1997-01-29
JPH05507730A (ja) 1993-11-04
AU1417192A (en) 1992-11-02
DK0532725T3 (da) 1997-06-02
US5536453A (en) 1996-07-16
SG47940A1 (en) 1998-04-17
ES2097319T3 (es) 1997-04-01
AU653010B2 (en) 1994-09-15
DE69217148D1 (de) 1997-03-13
IL101379A0 (en) 1992-11-15
ATE148462T1 (de) 1997-02-15
US5481001A (en) 1996-01-02
DE69217148T2 (de) 1997-08-14
IL101379A (en) 1996-05-14
JP3122465B2 (ja) 2001-01-09
EP0532725A1 (fr) 1993-03-24

Similar Documents

Publication Publication Date Title
IE914012A1 (en) New oxazolopyridine derivatives, processes for preparing¹these and pharmaceutical compositions containing them
JPS6272676A (ja) 置換または未置換２，５−ジケトピペラジンの製造方法
Guang‐Fu et al. Syntheses and properties of new herbicidal 2‐arylthio‐l, 2, 4‐triazolo [l, 5‐a] pyrimidine derivatives
CA1215978A (fr) Preparation de derives de la 2-carbamoyloxyalcoyl- 1,4-dihydropyridine; produits intermediaires utilises pour cette preparation
US3948894A (en) 3-Amino-5,6-diaryl-1,2,4-triazines
US5536453A (en) Light screening agent
EP0173050B1 (fr) Dérivés de 2,2,6,6,-tétraméthyl-4-pipéridinyle et leur utilisation comme stabilisants à la lumière
US4008232A (en) 3-Amino-5,6-diaryl-1,2,4-triazines
US3979516A (en) Anti-inflammatory 3-amino-5,6-diaryl-1,2,4-triazines
AU746588B2 (en) Stereoisomeric indole compounds, process for the preparation of the same, and use thereof
KR20010005943A (ko) 0-(3-아미노-2-히드록시-프로필)-히드록심산할라이드의 제조방법
Gataullin et al. Reactions of N-and C-Alkenylanilines: I. Synthesis of Anilides and Amidines from ortho-Alkenyl (cycloalkenyl) anilines and Their Transformations
Balaban et al. Hindered rotation around the N (sp2)-C (sp3) single bond in 2, 4, 6-trimethyl-N-alkylpyridinium cations: H DNMR analysist
Shaabani et al. The reaction of alkyl isocyanides and benzylidene Meldrum's acid derivatives in the presence of water: A one-pot synthesis of 4-(alkylamino)-3-aryl-4-oxobutanoic acids
Ito et al. Retro‐ene reactions in heterocyclic synthesis. II. A facile synthetic method for 4‐hydroxy‐2‐pyridones
Gray et al. Methyl β-(m-Chloroanilino)-acrylate
Bellas et al. Syntheses of heterocyclic compounds. Part XIX. Preparation and nucleophilic reactions of polyhalogeno-substituted N-oxides
US4940575A (en) 4-hydroxyisoxazole derivatives, method of preparing same, and cosmetic and pharmaceutical compositions containing them
US3965144A (en) Carbanilate compound for erythemal protection
JP3570716B2 (ja) 光保護フィルターとしてのα−ヒドロキシケトアルキル誘導体の使用
JP4154018B2 (ja) アリールアミノメチレンショウノウ誘導体及びその使用
KR820000137B1 (ko) 프로피온산 유도체의 제조방법
Škof et al. The synthesis of azahomotryptophane derivatives. The transformation of N‐trifluoroacetyl‐5‐bromo‐4‐oxonorvaline methyl ester into 4‐(imidazo [1, 2‐a] azinyl‐3)‐4‐oxohomoalanine derivatives
FR2470116A1 (fr) Derives benzylideniques, leur preparation et leur application en therapeutique
GB2134521A (en) Improvements in or relating to the synthesis of nizatidine

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU BR JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LU MC NL SE

WWE Wipo information: entry into national phase

Ref document number: 1992907129

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1992907129

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1992907129

Country of ref document: EP